GB/T 40034-2021.Validation of leaf area index remote sensing products.
1 Scope
GB/T 40034 specifies the basic requirements, test methods and test report formats for authenticity verification of leaf area index remote sensing products.
GB/T 40034 is applicable to authenticity verification of leaf area index remote sensing products.
2 Normative references
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, the latest version (including all amendments) applies to this document.
GB/T 36296-2018 Guidelines for authenticity verification of remote sensing products
GB/T 39468-2020 General method for authenticity verification of land quantitative remote sensing products
3 Terms and definitions
The terms and definitions defined in GB/T 36296-2018 and GB/T 39468-2020 and the following terms and definitions apply to this document.
3.1
Leaf area indexleaf area index;LAI
One-half of the total area of ​​leaves per unit projection area on the ground.
3.2
Effective leaf area indexeffective leaf area index
The leaf area index equal to the observed porosity value under the condition of random leaf distribution.
Note: It can be obtained indirectly through optical instrument measurement or remote sensing inversion.
3.3
Clumping index
Describes the spatial distribution pattern of random, regular and clustered distribution of leaves in the canopy in nature.
3.4
​​ Elementary sampling unit; ESU
A regional unit for measuring leaf area index arranged in the ground observation field.
3.5
Wireless sensor networks; WSN
A network formed by organizing and combining sensor nodes in a free style through wireless communication technology.
This standard specifies the basic requirements, inspection methods and inspection report format for authenticity inspection of leaf area index remote sensing products. This standard applies to the authenticity inspection of leaf area index remote sensing products.

ICS07.040
National Standard of the People's Republic of China
GB/T40034—2021
Validation of leaf area index remote sensing products products2021-04-30ReleasebzxZ.net
State Administration for Market Regulation
National Standardization Administration
2021-11-01Implementation
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Normative reference documents
3 Terms and definitions
Basic requirements
Test methods
Selection of test methods
5.2 Direct test method
Sampling method
Test process
5.3 Indirect test method
Multi-scale step-by-step test method of ground measurement and high-resolution sensing data based on the intersection test method of leaf area index remote sensing products with known mass accuracy6 Test report|| tt||Cover information
Text information
Overview of leaf area index remote sensing products to be tested
Description of reference objects
Testing methods and procedures
Authenticity test conclusion
Additional information
6.3 Brief information table of test report
Appendix A (Informative Appendix) Stratified sampling method Appendix B (Informative Appendix) Ground measurement method of leaf area index Appendix C (Informative Appendix) Measurement method of forest parameters: t+
Appendix D (Informative Appendix)
Spatial representativeness evaluation method
Appendix E (Informative Appendix) Accuracy evaluation index and calculation method References
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GB/T 40034—2021
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